<?php

/** 
 * File: SimpleImage.php 
 * Author: Simon Jarvis 
 * Copyright: 2006 Simon Jarvis 
 * Date: 08/11/06 
 * Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
 * 
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License 
 * as published by the Free Software Foundation; either version 2 
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details: 
 * http://www.gnu.org/licenses/gpl.html
 * */
class SimpleImage {
    var $image;
    var $image_type;
    
    function load($filename) {
        $image_info       = getimagesize($filename);
        $this->image_type = $image_info[2];
        if ($this->image_type == IMAGETYPE_JPEG) {
            $this->image = imagecreatefromjpeg($filename);
        } elseif ($this->image_type == IMAGETYPE_GIF) {
            $this->image = imagecreatefromgif($filename);
        } elseif ($this->image_type == IMAGETYPE_PNG) {
            $this->image = imagecreatefrompng($filename);
        }
    }
    
    function save($filename, $image_type = IMAGETYPE_JPEG, $compression = 75, $permissions = null) {
        if ($image_type == IMAGETYPE_JPEG) {
            imagejpeg($this->image, $filename, $compression);
        } elseif ($image_type == IMAGETYPE_GIF) {
            imagegif($this->image, $filename);
        } elseif ($image_type == IMAGETYPE_PNG) {
            imagepng($this->image, $filename);
        }
        if ($permissions != null) {
            chmod($filename, $permissions);
        }
    }
    
    function output($image_type = IMAGETYPE_JPEG) {
        if ($image_type == IMAGETYPE_JPEG) {
            imagejpeg($this->image);
        } elseif ($image_type == IMAGETYPE_GIF) {
            imagegif($this->image);
        } elseif ($image_type == IMAGETYPE_PNG) {
            imagepng($this->image);
        }
    }
    
    function getWidth() {
        return imagesx($this->image);
    }
    
    function getHeight() {
        return imagesy($this->image);
    }
    
    function resizeToHeight($height) {
        $ratio = $height / $this->getHeight();
        $width = $this->getWidth() * $ratio;
        $this->resize($width, $height);
    }
    
    function resizeToWidth($width) {
        $ratio  = $width / $this->getWidth();
        $height = $this->getheight() * $ratio;
        $this->resize($width, $height);
    }
    
    function scale($scale) {
        $width  = $this->getWidth() * $scale / 100;
        $height = $this->getheight() * $scale / 100;
        $this->resize($width, $height);
    }
    
    function resize($width, $height) {
        $new_image = imagecreatetruecolor($width, $height);
        imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
        $this->image = $new_image;
    }
    
    function fromString($data, $type) {
    	$this->image = imagecreatefromstring($data);
    	
    	if ($type == 'image/jpeg') {
    		$this->image_type = IMAGETYPE_JPEG;
    	} else if ($type == 'image/png') {
    		$this->image_type = IMAGETYPE_PNG;
    	} else if ($type == 'image/gif') {
    		$this->image_type = IMAGETYPE_GIF;
    	}
    	
    }
    
    function echoImage() {
    	if ($this->image_type == IMAGETYPE_JPEG) {
    		imagejpeg($this->image);
    	} elseif ($this->image_type == IMAGETYPE_GIF) {
    		imagepng($this->image);
    	} elseif ($this->image_type == IMAGETYPE_PNG) {
    		imagegif($this->image);
    	}
    }
}
?>
